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Valles Marineris

Next to the Tharsis Ridge is Valles Marineris. Valles Marineris is a large system of
canyons that stretches 4000 km (2500 mi) along the equator of
Mars. It was first imaged in detail by Mariner 9.

As can be seen in the image, many huge ancient river channels originate from northerly canyons and extend north, toward the top of the image. The three Tharsis
volcanoes (dark red spots) are visible on the leftmost (western) edge of the image. To the south are the highlands; very ancient ground, covered by many craters.

Layered rocks on Earth form from sedimentary processes (such
as those that formed the layered rocks now seen in Arizona's
Grand Canyon) and volcanic processes (such as layering seen in
the Waimea Canyon on the island of Kauai). Both origins are
possible for the Martian layered rocks seen in Valles Marineris. In
either case, the total thickness of the layered rocks seen in
these images indicates that there may have been a complex and extremely active early
history for geologic processes on Mars.

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